• Title, Summary, Keyword: Mortar shringkage

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An Experimental Study on the Properties of Drying Shrinkage for Alkali-Activated Slag Mortar (알칼리 자극제를 혼입한 고로슬래그 모르타르의 건조수축 특성에 관한 실험적 연구)

  • Chun Jung-Hwan;Kim Jae-Hun;Jee Nam-Yong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.97-100
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    • 2006
  • This paper report the result of the investigation on the properties of drying shrinkage for alkali-activated slag mortar in different relative humidity Commonly we know that drying shrinkage means lost more moisture but the mechanism of drying shrinkage of alkali activated slag mortar is not entirely due to the quantity of weight loss of water from mortar. pore size distribution and the calcium silicate hydrate gel characteristics have a critical influence on the magnitude of drying shringkage to alkali activated slag mortar. For this investigation, Ca(OH)2, Na2SiO4 were as alkali activator with 5 dosages(6%, 9%, 12%, 15%, 20%) and curing condition were three different relative humidity(35%, 65%, 95%) at $20{\pm}3^{\circ}C$

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High Volume Mineral Admixture Mortar According to Waste Refractory and Mixing Ratio (저미분 폐내화물 종류 및 혼입율 변화에 따른 혼화재 다량치환 모르타르의 공학적 특성)

  • Han, Sang-Yoon;Park, Do-Young;Cha, Cheon-Soo;Kim, Hyun-Woo;Yoon, Gi-Won;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.134-135
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    • 2015
  • This study analysed compressive strength and the expansion characteristic to utilize a high volume mineral admixture mortar for a aerated mortar and a plastering mortar. In this experiment, the result shows that the compressive strength gain was satisfactory in case that WR was replaced within 5%. Also, the difference between WR1 and WR was insignificant. It shows that the drying shringkage properties at large was showed being satisfactory generally compared with Plain when WR was replaced, but the effect was not significant.

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Drying Shrinkage Reduction of Redispersible Polymer Powder-Modified Mortars Using Powdered Shrinkage-Reducing Agent (분말수축저감제를 이용한 제유화형 분말수지 혼입 폴리머 시멘트 모르터의 건조수축 저감효과)

  • ;Ohama, Yoshihiko
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.231-236
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    • 1998
  • In general, the drying shrinkage of polymer-modified mortars using redispersible polymer powders is much higher than that of unmodified mortar. The purpose of this study is to reduce the drying shringkage of polymer-modified mortars using a redispersible poly(ethylene-vinyl acetate) (EVA) powder, which is widely used for the manufacture of prepackaged-type polymer-modified mortar products at present. Polymer-modified mortars using the redispersible EVA powder with powdered shrinkage-reducing agent were prepared with various polymer-cement ratios and shrinkage-reducing agent contents, and tested for drying shrinkage and strength. From the test results, the drying shrinkage of the redispersible EVA powder-modified mortars with a powdered shrinkage agent is remarkably reduced with increasing shrinkage-reducing agent content, and becomes approximately a half of that of the redispersible EVA powder-modified mortars with the same polymer-cement ratios and without the shrinkage-reducing agent at a shrinkage-reducing agent content of 6%.

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Influence of Limestone Powder on the Hydration of Cement Contained much Chloride (석회석 미분말이 염소고함유시멘트의 수화반응에 미치는 영향)

  • Jeong, Chan-Il;Lee, Eui-Hak;Lee, Kyung-Hee
    • Journal of the Korean Ceramic Society
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    • v.43 no.9
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    • pp.537-543
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    • 2006
  • Length change, hydration heat, setting time and compressive strength of OPC were measured by adding KCl and replacing limestone powder so as to examine the influence of limestone powder on hydration of the OPC contained much chloride. In general, the chloride modified cement was high in heat of hydration, short in its setting time, low in its fluidity and low in its strength at 28 days due to the sudden hydration in its initial stage. As a result of the experiment, it has been demonstrated that heat of hydration, became low as one replaced limestone powder to the chloride modified cement, and the fluidity and shrinkage rate of mortar decreased without change in setting time; furthermore, the compressive strength at 28 days was improved.